Electromagnetic Field Theory
Which of the following statement is correct for divergence of electric and magnetic flux densities?

 It is zero for the electric flux density.
 It is zero for the magnetic flux density.
 These are zero for static densities but non zero for time varying densities.
 Both are zero.

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Electromagnetic Field Theory
Gradient of scalar field is expressed as

 Outward flux of a vector field per unit volume as the volume about the point tends to zero.
 Maximum rate of increase of scalar function at a point.
 Circulation of a vector field per unit area as the area tends to zero.
 Gradient of divergence of a vector field minus the curl of the vector field.

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